Description
Dropping funnel, 250 ml, socket NS 29/32, cone NS 29/32 with PTFE stopcock 4 mm is a graduated cylindrical laboratory funnel engineered for controlled reagent addition. Made of borosilicate glass 3.3, it combines chemical durability with optical clarity. The cylindrical body is graduated for volume tracking, while the outlet tube terminates in a cone NS 29/32 joint fitted with a drip tip. A PTFE stopcock (NS 14,5, bore 4 mm) delivers smooth, grease-free flow control suitable for larger-volume additions. Nominal capacity is 0,25 l and net weight 0,268 kg, supporting preparative synthesis, extractions and quantitative transfers. Standard ground-glass joints allow direct connection to flasks and reactors. Supplied as one piece from manufacturer Rettberg, the funnel is well suited to organic chemistry workflows that demand precise dosing and reliable joint integrity. The inert PTFE stopcock and robust borosilicate construction ensure consistent performance under typical laboratory thermal and chemical conditions.
This article is part of Dropping funnels, in Funnels.
Key features
- Pack size: 1 pc(s)
- Nominal volume: 250 ml
- Material: Borosilicate glass 3.3
- Socket: NS 29/32
- Cone: NS 29/32
- Stopcock: PTFE NS 14,5, bore 4 mm
- Technical Information Sheet:
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Questions about Dropping funnel, 250 ml, graduated, cone/socket size 29/32,
What is this article?
Dropping funnel, 250 ml, graduated, cone/socket size 29/32, is the article on this page. Luminix Health distributes Rettberg for laboratory use. It sits in Dropping funnels, inside Funnels, in Labware.
A dropping funnel adds a liquid slowly into a closed reaction through a stopcock and usually a ground joint. A pressure-equalising arm keeps the funnel from air-locking. The joint size and the volume are the specification.
A funnel guides a liquid or a powder into a narrower mouth. A filter funnel holds a paper. A Büchner funnel is the flat perforated plate used with vacuum. A separating funnel has a stopcock so two liquid layers can be run off one at a time. A dropping funnel adds a reagent slowly into a reaction. The bore and the stopcock are the parts that matter. This glassware is listed under ISO laboratory glassware.
Which category should I open next?
The category is Funnels. The sub-category is Dropping funnels. The catalogue is Labware.
Shelves beside this one are Funnels (plastic, glass & steel), Büchner & filter funnels, Separating funnels and Powder funnels.
What should I check before I order?
When this page shows a safety data sheet, use that manufacturer file. Hazard text does not belong in the sales description. For a pack size, a grade or a certificate that is not on the page, send a quote request or contact the team.
How does ordering and shipping work?
Luminix Health distributes this article from the heart of Europe. Articles in stock ship within 2–5 business days. Standard delivery is free from €250 excl. VAT. Cold-chain goods and dangerous goods under ADR are never included in that free delivery. The terms are in the Shipping Policy. The full brand index is on shop by brand. Who we are is on about us.
Which other categories should I open?
The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.